Valve-gear for engines.



No. 856,851. PATENTED JUNE 11, 1907. A. L. DORSEY. VALVE GEAR FOR ENGINES.

APPLICATION FILED MAY 5,1906.

2 SHEETSSHEET 1.

ATTORNEY ms Mourns PETERS c0. WASHINGTON, 0.;-

No. 856,851. PATENTED JUNE 11, 1907. A. L. DORSEY.

VALVE GEAR FOR ENGINES.

APPLICATION FILED MAY 5,1906.

2 SHEETS-SHIIET 2.

WITNESSES @7 am W W A TTORNEY.

ARCHIE L. DORSEY, OF RUSSELL TOWNSHIP, PUINAM COUNTY, INDIANA.

VALVE-GEAR FOR ENGINES.

Specification of Letters Patent.

Patented June 11, 1907.

Application filed May 5,1906. Serial No. 315,409.

To all whmn it may concern:

Be it known that I, ARCHIE L. Donsnr, a

citizen of the United States, residing in Rusfull, clear, and exact description of the invention, reference being had to the accompanying drawings, and to the letters and figures of reference marken thereon, which form a part of this specification.

This invention relates to reversible engines, particularly to steam engines, whether stationary, portable, or locomotive, and the invention has reference especially to valve gearing thereof.

Objects of the invention are to provide improved reversing valve gearing for engines, so constructed as to permit operating engineers to readily readjust the parts thereof when lost motion results from wear in use, in order to maintain correct motions of the main valve or valves that control the admission of steam to the engine-cylinder or cylinders, a further object being to provide an improved support for shifting links and improved connections therefor that may be readjusted by unskilled attendants, without requiring shop tools or loss of time in sending such parts to shops for repairs or renewals, all to the end that durability and economy in ultimate results may be attained in a high degree.

, lVith the above-mentioned and minor obj ects in view, the invention consists in an engine provided with a novel form of shifting link and hanger therefor, and in novel mechanism for moving and controlling the hanger; and, the invention consists further in the novel parts and the combinations and arrangements of parts, as hereinafter particularl y described and claimed.

Referring to the drawings, Figure 1 is a side elevation of the main portion of a stationary engine having the invention applied thereto, parts of the engine being shown in section (approximately on the plane of the line A A in Fig. 2); Fig. 2, a top plan of the engine and invention thereon; Fig. 3, a f ragmentary side elevation of the shifting link and its hanger and an eccentric rod having a novel form of connection with the link; Fig. 4., a side elevation of the link and its support and connections Fig. 5, an end elevation of the link and its support and connections; Fig. 6, a horizontal sectional view of the link and its supporting devices (taken as on the line B-B in Fig. 7) Fig. 7, a vertical sectional view of the supporting devices of the link, as on the plane of the line CC in Fig. 6 Fig. 8, a vertical sectional View of the immediate supporting devices of the link on the line D-D in Fig. 7; and, Fig. 9, a fragmentary vertical sectional view as on theplane of the line E-E in Fig. 6. i

In order to conveniently describe the invention, a simple type of stationary engine is shown in the drawings for the purpose, and it will be understood that the invention is equally applicable to other types of engines.

In the drawings, a designates the main frame or bed of the engine f the main shaft c, the balance wheel or belt wheel on the shaft; d, the stean'i-cylinder; c, the valvechest;f the valve-stem supported in a guide 10 g and h the eccentrics i and the eccentrio-straps; and 7t and Z, the eccentric-rods, of the engine, all being of suitable wellknown construction except as hereinafter specified.

In practically carrying out the invention a standard F having a slot m is provided and suitably adapted to fit a part of the engine frame, or in some cases it may be attached to the boiler of a portable or locomotive engine where the boiler may be used as part of the engine frame. The standard serves as a guide and support for the link mechanism and is designed to be reversible to either right hand or left hand use. In the present case the standard is attached to the engine frame between the main shaft and the valvechest, and a link-bearer G- is supported and guided by a crosshead G that is mounted so as to be adjusted vertically and guided in the standard which is provided with an adjustable bearing piece or slip H having adjusting screws 72, and adjustable guides I and I that enga e the crosshead G, other parts of the stanc ard being adapted to guide opposite sides of the crosshead and it will thus be seen that lost motion between the crosshead and its guides may be readily eliminated. A suitable wrist-pin p is attached to the crosshead G and extends through the slot m of the standard. A link-holder J is formed as a sliding guide-bar and is mounted movably in the link-bearer G which is provided with an adjustable cap K on its top, and an adjustable bearing piece or slip L in a side thereof provided with adjusting screws 9, so that the link-holder may be kept free of lost motion in its guiding supporter, being in contact with the cap and the bearing piece. The link-holder J has a pair of arms M and M that project horizontally and are formed as journal bearings and provided with hearing caps r.

A shifting link N is provided with a boss 8 in which a pivot 2i is secured that extends through the boss so as to form a pair of trunnions at opposite sides of the link, the boss being attached to the middle portion of one main part of the link at one side of the link slot, and the pivot is mounted rotatively in the arms M and M, so that the link pivot may move in a plane toward or from the valve-chest, being arranged between the valve-chest and the link-bearer Gr. The link has two wrist-pins u and v secured thereto, and the eccentric rod lc extends above the link-bearers and is adjustably connected to the wrist-pin a, while the eccentric rod Z extends imder the link-bearer and is adjustably connected to the wrist-pin e, the eccentric rods having adjustable caps w in engagement with the wrist-pins for taking up lost motion. The link N has a movable block or die O mounted in its slot and connected to the valve stem f by means of a pivot pin x.

The mechanism for shifting the link N with respect to the valve stem comprises a pivot that is secured to the standard F, a tumbler P that is formed as a triangle and journaled at one of its corners on the pivot 'y and provided with an adjustable bearing cap 11 that engages the pivot. At another corner of the tumbler a wrist-pin 12 is secured thereto to which a lifting link Q is connected adjustably, being provided with an adjustable bearing cap 13 that engages the wrist-pin, and the link Q is connected adjustably to the wrist-pin p of the crosshead G to control and shift the crosshead, the link Q having an adjustable bearing cap 14 in engagement with the wrist-pin p. The remaining corner of the triangular tumbler is provided with a wrist-pin 15 that is secured thereto, and a reach-rod R having an adjustable bearing cap 16 is connected to the wrist-pin 15 and also to a reverse-lever S that is suitably supported and in operative connection with a quadrant T which also is suitably supported so as to hold the reverse-lever, the latter having a suitable latch engaging the quadrant.

It will be-understood from the foregoing that the link-holder may be withdrawn from one side of the link-bearer and inserted into the opposite side thereof, so as to be adjusted to conditions in case it be desired to reverse the position of the standard or mount it on the opposite side of the engine. It should be understood also that in some cases a rock-shaft and arms may be interposed between the link block and the valve stem. Also in case of reversal of the standard, the reach-rod may be turned over so as to extendgfrom the tumbler in the direction opposite to that shown.

In practical use, the reverse lever is to be operated in the usual manner and move the tumbler which in turn may either raise or lower the link so as to shift the positions of the eccentric rods with respect to the valve stem, as will be understood, and during operation of the engine the shifting link-holder will slide in a horizontal plane and carry the link while being moved by the link, the latter being moved by the eccentrics to operate the valve-stem and consequently the steam valve of the engine. When lost motion occurs at any of the bearings, compensation may be quickly made by means of the adjustable parts of the bearings, but the link-holder being so designed as to permit of very large bearing surfaces, will not require frequent re-adjustments, nor will the pivotal supports of the link, being arranged at both sides of the link, which construction prevents the link from wearing its bearings unevenly.

Having thus described the invention, what is claimed as new is 1. A valve-gear including a stationary standard having a guide, a crosshead mounted on the guide, a link-bearer attached to the crosshead and provided with an adjustable cap on its top and also an adjustable bearing slip in a side thereof, a link-holder mounted in the link-bearer and having a pair of arms provided with bearings and bearing caps, and

a shifting link pivoted in the bearings.

2. An engine including a standard having a slot therein and provided also with guides, a crosshead mounted adj ustably in the guides and having a wrist-pin attached thereto and extending through the slot of the standard, a movable tumbler mounted on the standard, a link connected to the wrist-pin and also to the tumbler, means for operating and controlling the tumbler, a link-bearer attached to the crosshead, a shifting link provided with a link-holder mounted movably on the link-bearer, eccentrics having rods connected to the shifting link, a link block movable in the shifting link, and a valve-stem connected with the link block.

3. An engine including a standard having adjustable guides, a crosshead mounted adjustably in the guides, means for adjusting and holding the crosshead in the guides, a link-bearer fixed to the crosshead, a linkholder mounted movably on the link-bearer and having a pair of arms provided with journal-bearings, a shifting link having a link block and pivotally supported by the journal-bearings, eccentrics having rods connected to the shifting link, and a valve-stem connected with the link block.

4. An engine including a standard having guides, a crosshead mounted adjustably in the guides, means for adjusting and holding the crosshead in the guides, a link-bearer fixed to the crosshead and provided with. an adjustable bearing-cap and also with an adjustable bearing-piece, a link-holder mounted slidingly in the link-bearer and engaged by the bearing cap and the bearing-piece, a shifting link having a link-block and pivoted to the link-holder, eccentrics having rods connected to the shifting link, and a valve-stem connected with the link-block.

5. An engine including a stationary standard having guides, a erosshead mounted adjustably in the guides, means for adjusting and holding the crosshead in the guides, a 1ink-bearer attached to the crosshead, a linkholder mounted movably on the link-bearer and having a bearing provided with an adjustable cap, a shifting link having a linkblock and pivoted in the bearing of the linkholder, eccentrics having rods connected to the shifting link, and a valvesten1 having operative connection with the link-block.

6. An engine including a stationary standard having guides, a crosshead mounted adjustably in the guides, means for adjusting and holding the crosshead in the guides, a link-bearer attached to the crosshead, a linkholder mounted movably in the link-bearer, a shifting link pivoted to the link-holder and provided with fixed wristpins, a linkblock having sliding connection with the shifting link, a pair of eccentrics, straps on the eccentrics, rods attached to the straps and having hearings in connection with the wrist-pins and provided with adjustable caps also in connection with the wrist-pins, and a valve-stem having operative connection with the linleblock.

7. An engine including a stationary standard having guides and also a fixed pivot, a crosshead adjustable in the guides and carrying a link-bearer, a link-holder mounted movably in the link-bearer, a shifting link pivoted on the link-holder and having a movable linkblock, a valve-stem having operative connection with the link-block, eccentrics having rods connected to the shifting link, a tumbler having a bearing in connection with the fixed pivot and provided with an adjustable bearing cap on the pivot, the tumbler having also two separate wrist-pins, a wristpin secured to the erosshead, a lifting linkhaving bearings provided with adjustable caps connected to the wrist-pin of the crosshead and also to one of the wrist-pins of the tumbler, a reach-rod connected to the other one of the wrist-pins of the tumbler, and means for holding or moving the reachrod.

In testimony whereof, I aflix my signature in presence of two witnesses.

ARCHIE L. DORSEY. WVitnesses:

O. M. ING, R. M. Fos'rnn. 

